Compared to ultraviolet waves, the wavelength of infrared waves is
A) shorter.
B) the same.
C) longer.
Answer: C
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How does the Sun's mass compare with that of the planets?
A) It is a hundred times more massive than all the planets combined. B) It is a thousand times more massive than all the planets combined. C) It is about as massive as all the planets combined. D) It is a thousand times more massive than Earth. E) It is a hundred times more massive than Earth.
Ice cream, when eaten, gives about 2100. Calories/kg to the body. On the other hand, the body must give back energy to warm it up to body temperature (37°C). Assuming ice cream has similar thermal properties to water:
(a) 1/2 kg produces how much energy? (b) 1/2 kg absorbs how much energy to reach 37°C? (c) What is the net gain or loss (eating 1/2 kg ice cream)?
Around Sun-like stars, we have, to date, only found Jupiter-like planets
Indicate whether the statement is true or false
Which of the following are active galaxies?
A. quasars B. radio galaxies C. Seyfert galaxies D. All of these choices are correct.